Revert of Set crash key if WM_QUIT message is received on GPU message loop....

Revert of Set crash key if WM_QUIT message is received on GPU message loop. (patchset #3 id:40001 of https://codereview.chromium.org/2342713002/ )

Reason for revert:
We've got enough data now.

Original issue's description:
> Set crash key if WM_QUIT message is received on GPU message loop.
>
> Threads seem to be exiting unexpectedly, so to help debugging set a
> crash key if an unexpected WM_QUIT message is received.
>
> BUG=647068
> TBR=scottmg@chromium.org
>
> Committed: https://crrev.com/18db6b0cc6f81fba74278cfab2856ccb11c0e0c7
> Cr-Commit-Position: refs/heads/master@{#419057}

TBR=dcheng@chromium.org,scottmg@chromium.org,rsesek@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=647068

Review-Url: https://codereview.chromium.org/2346353002
Cr-Commit-Position: refs/heads/master@{#419543}

base/message_loop/message_pump_win.cc

@@ -9,7 +9,6 @@
 
 #include <limits>
 
-#include "base/debug/crash_logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
@@ -637,11 +636,6 @@ bool MessagePumpForGpu::ProcessNextMessage() {
     return false;
 
   if (msg.message == WM_QUIT) {
-    // Try to figure out if we've received a WM_QUIT targeted towards a
-    // window. http://crbug.com/647068
-    // TODO(jbauman): Remove once we've got some data about this.
-    base::debug::SetCrashKeyValue("received_quit_message",
-                                  base::StringPrintf("%d", !!msg.hwnd));
     // Repost the QUIT message so that it will be retrieved by the primary
     // GetMessage() loop.
     state_->should_quit = true;

blimp/engine/app/blimp_engine_crash_keys.cc

@@ -105,9 +105,6 @@ size_t RegisterEngineCrashKeys() {
       // Temporary for https://crbug.com/630496.
       { "swdh_get_registration_cannot_host_url", crash_keys::kLargeSize },
       { "swdh_get_registration_cannot_document_url", crash_keys::kLargeSize },
-
-      // Temporary for https://crbug.com/647068.
-      { "received_quit_message", crash_keys::kSmallSize },
     };
 
   return base::debug::InitCrashKeys(engine_keys, arraysize(engine_keys),

chrome/app/chrome_crash_reporter_client_win.cc

@@ -179,9 +179,6 @@ size_t RegisterCrashKeysHelper() {
       // Temporary for https://crbug.com/630496.
       {"swdh_get_registration_cannot_host_url", crash_keys::kLargeSize},
       {"swdh_get_registration_cannot_document_url", crash_keys::kLargeSize},
-
-      // Temporary for https://crbug.com/647068.
-      {"received_quit_message", crash_keys::kSmallSize},
   };
 
   // This dynamic set of keys is used for sets of key value pairs when gathering

chrome/common/crash_keys.cc

@@ -228,9 +228,6 @@ size_t RegisterChromeCrashKeys() {
     // Temporary for https://crbug.com/630496.
     { "swdh_get_registration_cannot_host_url", crash_keys::kLargeSize },
     { "swdh_get_registration_cannot_document_url", crash_keys::kLargeSize },
-
-    // Temporary for https://crbug.com/647068.
-    { "received_quit_message", crash_keys::kSmallSize },
   };
 
   // This dynamic set of keys is used for sets of key value pairs when gathering